 
 include "russian-doll.rnc"
 {
 start = 
       element library
       {
          attribute id { text },
          element book
          {
             attribute id { text },
             attribute available { text },
             element isbn { text },
             element title { attribute xml:lang { text }, text },
             element author
             {
                attribute id { text },
                element name { text },
                element born { text },
                element dead { text }?
             }*,
             element character
             {
                attribute id { text },
                element name { text },
                element born { text },
                element qualification { text }
             }*
          }+
       }
 }
